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Top Forums Programming Number of bytes in terminal input queue w/o blocking and consuming? Post 302282240 by fpmurphy on Friday 30th of January 2009 11:06:43 AM
Old 01-30-2009
There is no standard API for returning this information. You need to use the FIONREAD ioctl if it is available on your platform. Typical code would be something like the following.
Code:
  #include <sys/ioctl.h>

  int chars_avail;
  int result;

  result = ioctl (tty, FIONREAD, &chars_avail);

 

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tapset::tty(3stap)														tapset::tty(3stap)

NAME
tapset::tty - systemtap tty tapset DESCRIPTION
tty.open Called when a tty is opened See probe::tty.open(3stap) for details. tty.release Called when the tty is closed See probe::tty.release(3stap) for details. tty.resize Called when a terminal resize happens See probe::tty.resize(3stap) for details. tty.ioctl called when a ioctl is request to the tty See probe::tty.ioctl(3stap) for details. tty.init Called when a tty is being initalized See probe::tty.init(3stap) for details. tty.register Called when a tty device is registred See probe::tty.register(3stap) for details. tty.unregister Called when a tty device is being unregistered See probe::tty.unregister(3stap) for details. tty.poll Called when a tty device is being polled See probe::tty.poll(3stap) for details. tty.receive called when a tty receives a message See probe::tty.receive(3stap) for details. tty.write write to the tty line See probe::tty.write(3stap) for details. tty.read called when a tty line will be read See probe::tty.read(3stap) for details. SEE ALSO
probe::tty.open(3stap), probe::tty.release(3stap), probe::tty.resize(3stap), probe::tty.ioctl(3stap), probe::tty.init(3stap), probe::tty.register(3stap), probe::tty.unregister(3stap), probe::tty.poll(3stap), probe::tty.receive(3stap), probe::tty.write(3stap), probe::tty.read(3stap), stap(1), stapprobes(3stap) IBM
--- tapset::tty(3stap)
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